I do like it but it seems a bit to long and a bit to skinny for 3 wheels and a large turret if the guns are powerful it would fall over, I think it needs to be fatter or add some thick treads on the back. Just my opinion :)

There's not a lot of unit entries so it'd be hard to tell ATM I'm sure, The Protoss will have to be added so whatever entries that are left will be split among the 3 races until then you wont have a very big selection.